When it unbinds, the resulting shape-change puts the tropomyosin bodyguards back into place.

当它解绑时，由此产生的形状变化使原保镖恢复原位。

Now shrimp shellfish and dust mites are all invertebrates and all of them trigger allergies thanks to a protein called tropomyosin.

虾等甲壳类动物和尘螨都是无脊椎动物，它们之所以触发过敏反应是因为一种叫做原的物质。

Namely, actin is blocked by a couple of protein bodyguards — called tropomyosin and troponin — which keep getting in the way.

也就是说，动被质的保镖阻断——原和钙——它们一直碍事。

Immediately after a muscle fiber is stimulated by a nerve — when calcium ions are flooding into the sarcomeres to pull away those two protein bodyguards of tropomyosin and troponin from the actin — that's called the latent period.

肉纤维被神经刺激后立即——钙离子涌入节，将动中保护原和钙的质带走——这称为潜伏期。

So the calcium latches on to the troponin and causes it to pull the other bodyguard protein — the tropomyosin — away from the sites on the actin strands that the myosin really wants to get its paws on.

所以钙锁住钙，并使其将另一种保护——原——从真正想要抓住的动链上的位置拉走。